How to grow Soybeans

Soybeans are versatile legumes that are widely grown for their edible beans and oil. They are a rich source of protein, fiber, and essential nutrients, making them an excellent addition to a healthy diet. Growing soybeans can be a rewarding experience, whether you are a seasoned farmer or a home gardener looking to try something new. In this guide, we will provide you with a comprehensive step-by-step approach to successfully growing soybeans. From selecting the right variety to harvesting mature pods, we will cover all the essential aspects to ensure a bountiful soybean harvest. So let’s dive in and learn how to grow soybeans!

Selecting the Right Variety

Before starting your soybean-growing journey, it is crucial to choose the right variety based on your location, climate, and intended purpose. There are numerous soybean varieties available, each with specific characteristics and adaptations. Consult with local agricultural extension services or experienced farmers to identify the varieties that perform well in your area. Consider factors such as maturity length, disease resistance, and yield potential when making your selection.

Preparing the Soil

Soybeans thrive in well-drained, fertile soil with a pH ranging from 6.0 to 6.8. Begin by clearing the planting area of any debris, rocks, or weeds. Remove all vegetation and loosen the soil using a tiller or garden fork to a depth of 6 to 8 inches. Incorporate organic matter, such as compost or well-rotted manure, to improve soil fertility and structure. Conduct a soil test to determine if any amendments, such as lime or sulfur, are necessary to adjust the pH level.

Planting Soybeans

Soybeans are typically planted after the last frost date in your region when the soil has warmed to at least 50°F (10°C) at a depth of 2 inches. Follow these steps for successful soybean planting:

Row Spacing

Soybeans can be grown in narrow rows or wide rows, depending on your preference and equipment availability. Narrow rows (7-15 inches) maximize light interception and weed suppression, while wide rows (30-36 inches) facilitate easier cultivation and mechanical harvesting.

Seeding Depth

Plant soybeans at a depth of 1 to 1.5 inches, ensuring good seed-to-soil contact. Deeper planting may lead to delayed emergence, while shallow planting can result in poor seedling establishment.

Seed Spacing

Aim for a final plant population of 150,000 to 200,000 plants per acre. Adjust the seeding rate based on the germination rate of the seeds and the desired plant population.


Soybeans have a symbiotic relationship with specific nitrogen-fixing bacteria called rhizobia. To enhance nitrogen fixation, consider inoculating the seeds with a suitable rhizobial inoculant before planting.

Planting Method

Soybeans can be sown using a grain drill, planter, or broadcast seeder. Ensure accurate seed placement and proper seed-to-soil contact to promote uniform germination and emergence.

Providing Adequate Water

Soybeans require adequate moisture throughout their growth cycle. While they are relatively drought-tolerant, water stress at critical stages can significantly impact yield. Follow these watering guidelines for optimal soybean growth:


If rainfall is insufficient, supplemental irrigation may be necessary, particularly during flowering and pod-filling stages. Apply water evenly to the soil, providing approximately 1 inch of water per week. Monitor soil moisture levels using a moisture meter or by checking the soil’s moisture content at a depth of 6 inches. Avoid overwatering, as excessive moisture can lead to diseases and poor root development.


Applying a layer of organic mulch around the soybean plants can help conserve soil moisture, reduce weed competition, and regulate soil temperature. Use straw, wood chips, or grass clippings as mulch, applying it around the base of the plants while leaving space around the stem to prevent rotting.

Managing Weeds

Weeds compete with soybeans for essential nutrients, water, and sunlight. Effective weed management is crucial to ensure optimal soybean growth and maximize yields. Follow these strategies to control weeds:

Pre-Planting Weed Control

Clear the planting area of weeds before sowing soybeans. Till or cultivate the soil to uproot existing weeds, or use a non-selective herbicide to kill them. Allow a gap of a few days between weed control and planting to ensure the effectiveness of the method used.


As mentioned earlier, mulching can suppress weed growth and minimize competition with soybean plants. Apply mulch around the base of the plants, extending it to cover the spaces between rows.


Use mechanical cultivation methods, such as hoeing or shallow tilling, to remove emerging weeds. Take care not to damage the soybean plants while cultivating.


Consider using herbicides labeled for soybeans to control weeds effectively. Follow the instructions provided on the herbicide label, including the recommended application rate and timing. Take precautions to avoid herbicide drift onto the soybean plants, as it can cause damage.

Fertilizing the Crop

Soybeans have relatively modest fertility requirements, but proper nutrient management is still important for healthy plant growth and optimum yields. Conduct a soil test before planting to determine the nutrient levels in your soil. Based on the results, follow these fertilization guidelines:

Nitrogen (N)

Soybeans are capable of fixing atmospheric nitrogen through their symbiotic relationship with rhizobia bacteria. Consequently, nitrogen fertilizer is generally not required for soybean crops. In fact, excessive nitrogen can promote excessive vegetative growth at the expense of pod and seed development.

Phosphorus (P) and Potassium (K)

Apply phosphorus and potassium fertilizers based on the soil test recommendations. These nutrients are crucial for root development, flowering, and seed formation. Incorporate the recommended fertilizers into the soil during soil preparation or apply them as a side dressing during the growing season.


In some cases, soybean crops may benefit from the application of micronutrients such as boron, zinc, or manganese. However, it is best to consult a local agricultural expert or your soil test results to determine if these nutrients are deficient in your soil and require supplementation.

Monitoring Pests and Diseases

Soybeans can be susceptible to various pests and diseases that can impact plant health and reduce yields. Regular monitoring and early detection are key to effective pest and disease management. Here are some common pests and diseases to watch out for:


Common insect pests that affect soybeans include aphids, bean leaf beetles, caterpillars, and stink bugs. Monitor your plants regularly for signs of insect damage, such as chewed leaves, stunted growth, or discoloration. If pest populations reach damaging levels, consider using appropriate insecticides or integrated pest management (IPM) strategies to control them.


Soybean diseases include fungal, bacterial, and viral infections. Some common diseases are soybean rust, bacterial blight, and brown spot. Monitor your plants for symptoms like leaf spots, wilting, stunted growth, or abnormal discoloration. If you suspect a disease issue, consult with local agricultural extension services or plant pathologists for accurate diagnosis and guidance on disease management strategies, including the use of disease-resistant soybean varieties and fungicides.


While we discussed weed management earlier, it is important to continuously monitor and control weed growth throughout the growing season. Regularly inspect your soybean field for any weed outbreaks and take appropriate action, such as hand-weeding, cultivation, or targeted herbicide applications.

Harvesting Soybeans

Harvesting soybeans at the right time is crucial for maximizing yield and quality. Here’s how to determine the optimal harvest time and harvest soybeans properly:


Soybeans are typically ready for harvest when the pods have reached their full size, and the beans inside have matured and hardened. The leaves of the plants may start turning yellow, and the stems may begin to dry and turn brown. Perform a seed maturity test by crushing a few pods. If the seeds are firm and hard, and they leave no indentation when pressed, they are ready for harvest.

Harvesting Methods

Soybeans can be harvested mechanically using a combined harvester or manually by handpicking. Combines are commonly used for large-scale production, while handpicking is suitable for small-scale or home gardens. When using a combine, adjust the settings according to the crop conditions and follow the manufacturer’s instructions. For handpicking, pull the entire plant from the ground and remove the beans from the pods manually.


After harvesting, soybeans may contain excess moisture. It is important to dry them to reduce the moisture content to a safe storage level (around 13%). Spread the harvested soybeans in a thin layer on a clean, dry surface in a well-ventilated area. Turn them regularly to ensure even drying.

Storing and Using Soybeans

Proper storage of soybeans is crucial to maintain their quality and prevent spoilage. Follow these guidelines for storing and using harvested soybeans:


Remove any debris, damaged or diseased beans, and foreign matter from the harvested soybeans before storage. Use a fan or air separator to clean the beans thoroughly.

Storage Containers

Store soybeans in clean, airtight containers such as bins, silos, or grain bags. Ensure the containers are free from moisture, pests, and rodents.

Temperature and Moisture Control

Soybeans should be stored in a cool, dry place to prevent spoilage. Maintain a temperature below 60°F (15°C) and a moisture content of around 13%.


Use your harvested soybeans for various purposes, such as cooking, and making tofu, soy milk, tempeh, or edamame. They can also be ground into soy flour or used as animal feed. Explore different recipes and cooking methods to enjoy the nutritional benefits of soybeans.


Growing soybeans can be a rewarding experience, whether you’re a farmer or a home gardener. By following the steps outlined in this guide, you can successfully grow soybeans and enjoy a bountiful harvest. Remember to select the right variety, prepare the soil adequately, provide sufficient water, manage weeds, fertilize appropriately, monitor pests and diseases, and harvest at the right time. With proper care and attention, you can cultivate healthy soybean plants and reap the nutritional benefits they offer. So, roll up your sleeves, get started, and enjoy the journey of growing your own soybeans!

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